Win 7/12.04 dual boot system. Win 7 works fine, but 12.04 rarely boots normally- I have to use repair. After 12.04 does boot, cyclical system error message/report error message/administrator log on. I was able to get reason "compiz closed /usr/bin/compiz" and contact askubuntu.com. Thanks for any help.

It probably is a bug in Compiz. Reinstalling won't really solve that issue. All you can do is to file a bug report and hope someone fixes the bug for you. On the other hand, removing Compiz will leave you with almost an unusable desktop.
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jokerdino♦Jun 30 '12 at 13:04